Calibrating hygrometer

[harris farm]

Is it possible for the meter to be off by 9% too low

 

[Ridgerunner]

Yes

 

[A.T. Hagan]

I think one should always calibrate a new hygrometer because as repeated posts here on the board demonstrate they can sometimes be off a good bit.

Here's the best article I've found on calibration yet: http://ezinearticles.com/?Prevent-Mold!-Hygrometer-Calibration&id=602308

I haven't use all the methods it lists, just the table salt (sodium chloride) one and it works well.